banana chips the real thing/s

[Unregistered]

Some friends are eating banana chips
Then I pull out real bananas and ask them if they want some.

Is the following correct? Which is correct or is there a better way to say it.\? singular/plural?
They say: We are eating banana/bananas already.
I say: Hey, these are the real things/this is the real thing/these are the real thing.
What you have is only chips/
What you have are only chips

[colloquium]

They say: We are already eating bananas.

(I'm not sure about this sentence, as they aren't actually eating a banana/bananas - so it's hard to decide whether to use a plural or singular noun. I would choose the plural.)

Also, I would put the adverb already inbetween the aux and main verb.

I say: these are the real thing.

(These: the bananas are the real thing: banana.)

What you have are only chips


These are my opinions.

I am not a teacher.